Just to add to torpedobait, I see the same TC drops especially when entering/leaving a a US base. TC of 128 is the max ans is still choppy. Also, get the "radar" announcement even if the boat has no surface radar or if it's turned off. Like wise when SD antenae is not up. The "radar" announcement is from the circling aircraft. Only clears up about 25nm from the base.
I've noticed this .52 and .53. Doesn't seem to matter which boat, as I've usded Gars, Porpoise, Gato and Balao.
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